SSL-Tools

SSL check results of smtp.resend.com

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Discover if the mail servers for smtp.resend.com can be reached through a secure connection.

To establish a secure connection a mail server has to offer STARTTLS (SSL), a trustworthy SSL certificate, support for the Diffie-Hellman-Algorithm to guarantee Perfect Forward Secrecy and must not be vulnerable against the Heartbleed attack. Futhermore we recommend using end-to-end encryption with GnuPG.

Summary

JSON Refresh

Report created Wed, 30 Apr 2025 15:17:21 +0000

The mailservers of smtp.resend.com can be reached through a secure connection.

Servers

Incoming Mails

These servers are responsible for incoming mails to @smtp.resend.com addresses.

Hostname / IP address Priority STARTTLS Certificates Protocol
smtp.resend.com
54.205.195.44
 -
supported
*.resend.com
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
5 s
smtp.resend.com
54.157.71.137
 -
supported
*.resend.com
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
5 s

Outgoing Mails

We have not received any emails from a @smtp.resend.com address so far. Test mail delivery

Certificates

First seen at:

CN=*.resend.com

Certificate chain
  • *.resend.com
    • remaining
    • 256 bit
    • ecdsa-with-SHA384
      • E6
        • remaining
        • 384 bit
        • sha256WithRSAEncryption
          • ISRG Root X1 (Certificate is self-signed.)
            • remaining
            • 4096 bit
            • sha256WithRSAEncryption
Subject
Common Name (CN)
  • *.resend.com
Alternative Names
  • *.apps.resend.com
  • *.resend.com
  • resend.com
Issuer
Country (C)
  • US
Organization (O)
  • Let's Encrypt
Common Name (CN)
  • E6
validity period
Not valid before
2025-04-30
Not valid after
2025-07-29
This certifcate has been verified for the following usages:
  • Digital Signature
  • TLS Web Server Authentication
  • TLS Web Client Authentication
Fingerprints
SHA256
4D:47:0A:24:10:94:CA:A9:C4:0D:A8:46:D3:83:55:A6:95:BC:26:52:DE:3E:83:18:59:CA:53:25:59:BE:EB:C7
SHA1
5F:E3:B7:DC:4C:AF:3B:3E:9D:0C:10:91:03:17:3E:F7:D5:62:1E:73
X509v3 extensions
subjectKeyIdentifier
  • C2:A5:E0:92:06:C3:1A:AF:6E:A8:BA:F3:92:AA:EA:44:E3:C6:D1:90
authorityKeyIdentifier
  • keyid:93:27:46:98:03:A9:51:68:8E:98:D6:C4:42:48:DB:23:BF:58:94:D2
authorityInfoAccess
  • OCSP - URI:http://e6.o.lencr.org
  • CA Issuers - URI:http://e6.i.lencr.org/
certificatePolicies
  • Policy: 2.23.140.1.2.1
crlDistributionPoints
  • Full Name:
  • URI:http://e6.c.lencr.org/90.crl
ct_precert_scts
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 12:F1:4E:34:BD:53:72:4C:84:06:19:C3:8F:3F:7A:13:
  • F8:E7:B5:62:87:88:9C:6D:30:05:84:EB:E5:86:26:3A
  • Timestamp : Apr 30 15:02:07.881 2025 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:46:02:21:00:A7:69:2B:95:72:A0:A9:2E:6E:60:DA:
  • D6:A4:AB:4B:44:DF:11:0D:54:C5:12:6E:28:61:38:09:
  • 5C:8C:F9:24:FA:02:21:00:8F:F1:A5:03:77:50:70:4D:
  • 65:05:A7:C8:04:DA:F4:43:5B:7A:23:E5:30:D9:E9:D2:
  • F0:57:74:FA:68:E2:0E:07
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 1A:04:FF:49:D0:54:1D:40:AF:F6:A0:C3:BF:F1:D8:C4:
  • 67:2F:4E:EC:EE:23:40:68:98:6B:17:40:2E:DC:89:7D
  • Timestamp : Apr 30 15:02:08.489 2025 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:20:70:22:97:C0:DD:CB:43:7E:B1:14:FC:91:
  • E6:CE:5A:4D:22:1A:F6:96:82:73:C4:03:1B:A9:D5:8E:
  • 50:86:40:FE:02:21:00:96:35:5B:15:41:2F:64:FC:06:
  • E4:9E:0F:95:2E:D4:63:B7:D1:69:0F:CA:F6:48:D0:5D:
  • B9:82:E1:46:38:23:F5